Ksp to Solubility Calculator

About this calculator

This calculator finds the molar solubility of a sparingly soluble 1:1 ionic salt (like AgCl or CaSO₄) from its solubility product constant, Ksp, using s = √Ksp. This comes directly from the equilibrium expression: for a salt that dissociates as AB ⇌ A⁺ + B⁻, Ksp = [A⁺][B⁻] = s × s = s².

Ksp is an equilibrium constant that describes how far a sparingly soluble salt dissolves in water before the solution becomes saturated, and converting it to molar solubility (mol/L) — and from there to g/L — tells a chemist exactly how much of the solid will actually dissolve. It's a foundation-level calculation in analytical and general chemistry, used for predicting precipitation reactions and interpreting solubility rules.